Here is the full list of all 31 Idle Clans achievements.
Reach max level in a skill
Join a minigame
Receive a boss key
Reach level 100 in a skill
Steal from the royal clan
Purchase your first property. It's nothing to brag to your parents about, but it's a start.
Refine an item
Equip diamond jewellery
Purchase an upgrade
Eat a burger in battle
Defeat a dragon
Achieved upon reaching your first million
Prepare a special dish
Create silver jewellery
Perform a leaderboard search
Send an item to your clan's vault
Join a clan
Create a clan
List an item for sale
Your first level up
Plunder a small, helpless village
Complete the tutorial
Reach a billion gold
Enchant an item
Defeat a boss
The true test for any respectable chef... Make a pizza.
Grow some watermelons
Create a godlike item
Battle a monster with an Outstanding weapon
Smith a piece of Astronomical armour
Purchase the most glamorous property available